9
JOHNSON CONTROLS
FORM 145.05-SU2 (1207)
SUPPLY FAN OPERATION
This feature tells the unit if is has a constant volume or
variable volume supply fan.
Field Wiring
None required.
Programming
The following item must be programmed through the
“
Setpoints
” section of the User Interface:
•
“Fan-VAV/CV En”
- must be set to VAV. The
default is VAV.
SUPPLY FAN DUCT STATIC PRESSURE
This feature allows the setting of the duct static control
point.
Field Wiring
None required.
Programming
The following items must be programmed through the
“
Setpoints
” section of the User Interface:
•
“Fan-S/A Pres SP”
– must be set to the duct static
value you want to maintain. The range is 0.0”
WC to 2.0” WC. The default value is 1.0” WC
•
“# of SP Sensors”
– The control has the capability
to use one or two duct static sensors. If a single
sensor is used this value would be set to 1. If two
sensors are used this value would be set to 2.
•
“SP Calc Method”
– If the unit uses two sensors
this value can be set to
“High, Avg, or Low”
. If
the control is programmed to
“High”
, the con-
trol will compare the higher of the two sensor
inputs to the
“Fan- S/A Pres SP”
and control
the speed of the VFD based on these values. If
the control is programmed to
“Low”
the control
will compare the lower of the two sensor inputs
to the
“Fan- S/A Pres SP”
and control the speed
of the VFD based on these values. If the control
is programmed to
“Avg”
the control will compare
the average of the two sensors to the
“Fan- S/A
Pres SP”
and control the speed of the VFD based
on these values.
VARIABLE AIR VOLUME (continued)
